Went trough all run.log CI_DRM_3677 - CI_DRM_3684, only one incomplete where igt@gem_tiled_swapping@non-threaded was run before:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3684/shard-kbl3/igt@gem_tiled_swapping@non-threaded.html
However,
<7>[ 38.122175] [IGT] gem_tiled_swapping: starting subtest non-threaded
last test in run.log is:
igt/drv_suspend/debugfs-reader-hibernate
<7>[ 154.190154] [IGT] drv_suspend: starting subtest debugfs-reader-hibernate
so more than 60 seconds rules out the previous non-threaded issue.
The "Last seen" calculation in cibuglog is not suitable for bugs with big impact, and KBL hitting Link training on previously affected subtests.
I will close this.